S
M
T
W
T
F
S
30
96°
75°
31
96°
74°
1
95°
75°
2
95°
74°
3
94°
73°
4
94°
73°
5
92°
72°
6
93°
73°
7
93°
72°
8
92°
71°
9
92°
70°
10
91°
71°
11
93°
72°
12
93°
72°
13
94°
71°
14
86°
73°
15
92°
72°
16
Hist. Avg.
88°
67°
17
Hist. Avg.
88°
67°
18
Hist. Avg.
88°
66°
19
Hist. Avg.
87°
66°
20
Hist. Avg.
87°
66°
21
Hist. Avg.
87°
65°
22
Hist. Avg.
86°
65°
23
Hist. Avg.
86°
64°
24
Hist. Avg.
86°
64°
25
Hist. Avg.
86°
64°
26
Hist. Avg.
85°
63°
27
Hist. Avg.
85°
63°
28
Hist. Avg.
84°
63°
29
Hist. Avg.
84°
62°
30
Hist. Avg.
84°
62°
1
Hist. Avg.
84°
62°
2
Hist. Avg.
83°
61°
3
Hist. Avg.
83°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Charleston
Charleston's September 2026 forecast shows daily high temperatures ranging from 86° to 96°, with overnight lows between 70° and 75°. The average high for September is 93° with an average low of 73°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Charleston. See also: October | November | December.
